Air conditioner



FIG. 1 is a front, right side and top perspective view of an air conditioner showing our new design,

FIG. 2 is a top plan view thereof,

FIG. 3 is a bottom plan view thereof,

FIG. 4 is a left side elevational view thereof, the right side being a mirror image of that shown; and

FIG. 5 is a rear elevational view thereof. 

The ornamental design for an air conditioner, as shown and described. 